i have exactly the same problem on my samsung nc10 (second computer)
00:1b.0 Audio device: Intel Corporation N10/ICH 7 Family High Definition Audio 
Controller (rev 02)
        Subsystem: Samsung Electronics Co Ltd Device ca00
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR- INTx-
        Latency: 0, Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 22
        Region 0: Memory at f0340000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: <access denied>
        Kernel driver in use: HDA Intel
        Kernel modules: snd-hda-intel

changing volume in pavucontol breaks the sound....and the fix helps to make it 
better, but it not complete
the symptom stay the same

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ubuntu-bug alsa-base Popping Clicking Pulse Audio crashing
https://bugs.launchpad.net/bugs/551949
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